JP2017099046A - Rotary electric machine and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine and a manufacturing method therefor, capable of improving the strength of a third rotor core to centrifugal force, without increasing a radial direction size.SOLUTION: A rotary electric machine 1 includes a first rotor core 12, a second rotor core 13 and a third rotor core 14. The first rotor core 12 and the second rotor core 13 include projections each including an axial projection. The third rotor core 14 includes an outer circumferential face holder 140, a side face holder 141 and a connector 143. The connector 143 connects the side face holder 141 adjacent in the peripheral direction inside the axial projection part in the radial direction, in a state that the projections of the first rotor core and the second rotor core are alternately disposed in the circumferential direction. This enables improvement in the strength of the third rotor core 14 to the centrifugal force, without increasing a radial dimension.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine and a method for manufacturing the same.

  Conventionally, as a rotating electrical machine, for example, there is a synchronous rotating electrical machine combined with a permanent magnet disclosed in Patent Document 1 shown below.

  This permanent magnet combined synchronous rotating electrical machine includes a first rotor core, a second rotor core, and a third rotor core. The first rotor core includes a protrusion that protrudes in the radial direction and protrudes in the axial direction. The second rotor core includes the same number of protrusions as the first rotor core, protruding in the radial direction and protruding in the axial direction. The second rotor core is disposed such that the protrusions are alternately arranged in the circumferential direction with respect to the first rotor core. The third rotor core includes an annular outer peripheral surface holding portion that contacts the outer peripheral surface of the first rotor core and the outer peripheral surface of the second rotor core and holds the outer peripheral surface.

  When the first to third rotor cores rotate, centrifugal force is applied to the protrusions. However, the outer peripheral surface of the protrusion is held by an annular outer peripheral surface holding portion. Therefore, even if the first to third rotor cores rotate, it is possible to suppress a situation in which the protruding portion is deformed radially outward.

Japanese Patent No. 3829888

  By the way, when the rotation speed of the first to third rotor cores further increases, the centrifugal force increases. As a result, the outer peripheral surface holding portion cannot withstand the centrifugal force, and the protruding portion may be deformed radially outward. On the other hand, a method for increasing the radial dimension of the outer peripheral surface holding portion to improve the strength against centrifugal force is conceivable. However, when the radial dimension of the outer peripheral surface holding portion is increased, the radial dimension of the permanent magnet combined synchronous rotating electric machine itself is increased. In addition, the magnetic characteristics change. As a result, the characteristics of the rotating electrical machine also change.

  The present invention has been made in view of such circumstances, and provides a rotating electrical machine capable of improving the strength of the third rotor core against centrifugal force without increasing the radial dimension, and a method for manufacturing the same. The purpose is to do.

  A first invention made to achieve the above object is a stator core provided with a stator winding, a radial protrusion protruding radially outward, a radial protrusion provided in an axial direction. A first rotor core having a plurality of protrusions each including an axial protrusion that protrudes, a radial protrusion protruding radially outward, and an axial protrusion provided in the radial protrusion and protruding in the axial direction A second rotor core having the same number of protrusions as the first rotor core, the protrusions being alternately arranged in the circumferential direction with respect to the first rotor core; An annular outer peripheral surface holding portion that contacts the outer peripheral surfaces of the protruding portion of the rotor core and the protruding portion of the second rotor core and holds the outer peripheral surface, a protruding portion of the first rotor core adjacent to the circumferential direction, and the first Provided integrally with the outer peripheral surface holding portion between the two rotor core protrusions, and on the side of the first rotor core protrusion A side surface holding portion that contacts and holds the side surface of the protruding portion of the second rotor core, and a radially inner side of the axially protruding portion of the first rotor core and the axially protruding portion of the second rotor core. A magnetic pole on the first rotor core and the second rotor core when a current flows, and a third rotor core having a connecting portion that connects side surface holding portions adjacent in the circumferential direction to at least one of the axial directions And a field winding for generating a magnetic flux for forming.

  According to this structure, the 3rd rotor core has a connection part which connects the side surface holding part adjacent to the circumferential direction in the radial inside of an axial direction protrusion part. Therefore, the strength of the third rotor core against centrifugal force can be improved without increasing the radial dimension.

  A second invention made to achieve the above object is a method of manufacturing a rotating electrical machine, wherein the rotating electrical machine includes a stator core provided with a stator winding and a radially projecting portion projecting radially outward. A first rotor core having a plurality of protrusions provided on the radial protrusions and having axial protrusions protruding in the axial direction; a radial protrusion protruding radially outward; and a radial protrusion The first rotor core has the same number of protrusions as the first rotor core, and the protrusions are alternately arranged in the circumferential direction with respect to the first rotor core. A second rotor core disposed on the outer periphery, an annular outer peripheral surface holding portion that contacts the outer peripheral surface of the first rotor core and the outer peripheral surface of the second rotor core protrusion, and holds the outer peripheral surface; Between the protrusion of the first rotor core and the protrusion of the second rotor core adjacent to each other Provided on the side surface of the first rotor core and the side surface of the second rotor core projecting portion, the side surface holding portion for holding the side surface, the axially projecting portion of the first rotor core and the first A current flows through the third rotor core having a connecting portion that connects the side surface holding portions adjacent in the circumferential direction to at least one of the axial directions on the radially inner side of the axially protruding portion of the two rotor core. And a field winding for generating magnetic flux for forming magnetic poles in the first rotor core and the second rotor core, and the third rotor core includes an outer peripheral surface holding portion, a side surface holding portion, A magnetic steel plate having a connecting portion formed so as not to be provided adjacent to the circumferential direction is used as a radial protrusion and an axial protrusion of the first rotor core, and a second rotation. Thickness is shifted in the circumferential direction according to the radial projection and axial projection of the child core Formed by stacking in.

  According to this method, the third rotor core having the connecting portion that connects the side surface holding portions adjacent in the circumferential direction on the radially inner side of the axial protruding portion is manufactured by laminating one type of electromagnetic steel plate. Therefore, the strength of the third rotor core against centrifugal force can be improved without increasing the radial dimension. In addition, the third rotor core can be manufactured with reduced cost.

It is a perspective sectional view of the rotary electric machine in a 1st embodiment. FIG. 2 is a perspective sectional view of a stator core and a stator winding shown in FIG. 1. FIG. 2 is a perspective sectional view of a first rotor core shown in FIG. 1. It is a perspective sectional view of the 2nd rotor core shown in FIG. It is a perspective sectional view of the 3rd rotor core shown in FIG. It is the top view seen from the axial direction of the magnetic steel sheet in the area | region F1 of the 3rd rotor core shown in FIG. It is the top view seen from the axial direction of the magnetic steel sheet in area | region F2 of the 3rd rotor core shown in FIG. It is the top view seen from the axial direction of the magnetic steel sheet in area | region F3 of the 3rd rotor core shown in FIG. FIG. 2 is a perspective sectional view of the field winding shown in FIG. 1. It is explanatory drawing for demonstrating the assembly | attachment state of a 1st rotor core, a 2nd rotor core, a 3rd rotor core, and a field winding. It is a perspective view of the 1st rotor core in the state where it assembled, the 2nd rotor core, and field winding. It is a perspective view of the 1st rotor core in the state where it assembled, the 2nd rotor core, the 3rd rotor core, and field winding. It is the top view seen from the axial direction of the 1st rotor core in the state assembled, the 2nd rotor core, the 3rd rotor core, and field winding. It is the top view seen from the axial direction of the 1st rotor core, the 2nd rotor core, the 3rd rotor core, and field winding in the state where it assembled in a 2nd embodiment. It is a perspective sectional view of the 3rd rotor core in a 3rd embodiment. It is the top view seen from the axial direction of the magnetic steel plate in area | region F1 of the 3rd rotor core shown in FIG. It is the top view seen from the axial direction of the magnetic steel plate in area | region F3 of the 3rd rotor core shown in FIG. It is a perspective sectional view of the rotary electric machine in a 4th embodiment. FIG. 19 is a perspective sectional view of the stator core and the stator winding shown in FIG. 18. It is a perspective sectional view of the 1st rotor core shown in FIG. It is a perspective sectional view of the 2nd rotor core shown in FIG. It is a perspective sectional view of the 3rd rotor core shown in FIG. FIG. 19 is a perspective sectional view of one field winding and yoke shown in FIG. 18. FIG. 19 is a perspective sectional view of the other field winding and yoke shown in FIG. 18. It is explanatory drawing for demonstrating the assembly | attachment state of a 1st rotor core, a 2nd rotor core, a 3rd rotor core, a field winding, and a yoke.

(First embodiment)
First, the configuration of the rotating electrical machine will be described with reference to FIGS.

  A rotating electrical machine 1 shown in FIG. 1 is a device that generates torque when supplied with electric power. The rotating electrical machine 1 includes a stator core 10, a stator winding 11, a first rotor core 12, a second rotor core 13, a third rotor core 14, a field winding 15, and a shaft. 16.

  The stator core 10 is an annular member made of a magnetic material that constitutes a part of the magnetic path and holds the stator winding 11. Specifically, as shown in FIG. 2, it is a member made of a laminate in which electromagnetic steel plates are laminated in the thickness direction.

  The stator winding 11 shown in FIG. 1 is a member that generates a magnetic flux when a current flows. As shown in FIG. 2, the stator winding 11 is held by the stator core 10.

  The first rotor core 12 shown in FIG. 1 is a member made of a magnetic material that forms part of a magnetic path and in which a magnetic pole is formed when a current flows through the field winding 15. Specifically, it is a member integrally composed of iron. As shown in FIG. 3, the first rotor core 12 includes a bottom portion 120 and a protruding portion 121.

  The bottom portion 120 is a substantially disc-shaped portion that is fixed to the shaft 16. Specifically, it is a gear-shaped portion having six tooth portions 120a at equal intervals in the circumferential direction. The bottom part 120 is provided with a hole part 120b penetrating in the axial direction to which the shaft 16 is fixed.

  The protruding portion 121 is a portion that protrudes radially outward from the outer peripheral surface of the bottom portion 120 and protrudes in the axial direction, and a magnetic pole is formed when a current flows through the field winding 15. Here, the radial direction is a direction orthogonal to the axial direction. The protrusion 121 includes a radial protrusion 121a and an axial protrusion 121b.

  The radial protruding portion 121a is a portion that protrudes radially outward from the outer peripheral surface of the tooth portion 120a.

  The axial protrusion 121b is a part that is provided in the radial protrusion 121a and protrudes in the axial direction. Specifically, it is a portion protruding in the same axial direction from one end face of the radial protrusion 121a.

  The second rotor core 13 shown in FIG. 1 constitutes a part of a magnetic path, and when a current flows through the field winding 15, a magnetic pole having a polarity different from that of the first rotor core 12 is formed. It is a member made of a material. Specifically, it is a member integrally composed of iron. As shown in FIG. 4, the second rotor core 13 includes a bottom portion 130 and a protruding portion 131.

  The bottom portion 130 is a substantially disk-shaped portion that is fixed to the shaft 16. Specifically, it is a gear-shaped portion having six tooth portions 130a at equal intervals in the circumferential direction. The bottom part 130 is provided with a hole part 130b penetrating in the axial direction to which the shaft 16 is fixed.

  The protrusion 131 protrudes radially outward from the outer peripheral surface of the bottom portion 130 and protrudes in the axial direction, and a current flows through the field winding 15, so that the protrusion 131 has a polarity different from that of the protrusion 121 of the first rotor core 12. This is the part where the magnetic pole is formed. The protrusion 131 includes a radial protrusion 131a and an axial protrusion 131b.

  The radial protruding portion 131a is a portion that protrudes radially outward from the outer peripheral surface of the tooth portion 130a.

  The axial protrusion 131b is a portion that is provided in the radial protrusion 131a and protrudes in the axial direction. Specifically, it is a portion protruding in the same axial direction from one end face of the radial protrusion 131a.

  The second rotor core 13 has the same shape as the first rotor core 12 shown in FIG. As will be described later, the second rotor core 13 is arranged such that the protrusions 121 and 131 are alternately arranged in the circumferential direction with respect to the first rotor core 12 shown in FIG.

  The 3rd rotor core 14 shown in FIG. 1 is a substantially annular member which consists of a magnetic material which comprises a part of magnetic path. Specifically, as shown in FIG. 5, it is a member made of a laminate in which electromagnetic steel plates are laminated in the thickness direction. The third rotor core 14 includes an outer peripheral surface holding portion 140, a side surface holding portion 141, a groove portion 142, and a connecting portion 143.

  As shown in FIG. 1, the outer peripheral surface holding portion 140 is an annular portion that contacts the outer peripheral surfaces of the protruding portions 121 and 131 and holds these outer peripheral surfaces.

  The side surface holding portion 141 is in contact with the side surfaces of the protruding portions 121 and 131 between the protruding portions 121 and 131 adjacent in the circumferential direction in a state where the protruding portions 121 and 131 are alternately arranged in the circumferential direction. It is a part which holds these side surfaces. The side surface holding portion 141 is provided integrally with the outer peripheral surface holding portion 140 between the protruding portions 121 and 131 adjacent in the circumferential direction.

  The groove portion 142 is a portion that is formed in the side surface holding portion 141 provided integrally with the outer peripheral surface holding portion 140 and that opens in the radial direction and extends in the axial direction.

  The connecting portion 143 connects the side surface holding portions 141 adjacent to each other in the radial direction inside the axial protruding portions 121b and 131b in a state where the protruding portions 121 and 131 are alternately arranged in the circumferential direction. It is a part. The connecting portion 143 is provided so as to connect the side surface holding portions 141 adjacent in the circumferential direction in the entire axial region of the axial protruding portions 121b and 131b and to contact the inner peripheral surface and hold the inner peripheral surface. Yes.

  The 3rd rotor core 14 is comprised by the laminated body which laminated | stacked the electromagnetic steel plates 14A-14C shown in FIGS. 6-8 in the plate | board thickness direction. The electromagnetic steel plates 14 </ b> A to 14 </ b> C include an outer peripheral surface holding portion 140, a side surface holding portion 141, a groove portion 142, and a connecting portion 143.

  As shown in FIG. 6, the electromagnetic steel sheet 14 </ b> A is provided with every other connecting portion 143 in the circumferential direction. As shown in FIG. 7, the electromagnetic steel sheet 14 </ b> B is provided in a state where the connecting portions 143 are adjacent to each other in the circumferential direction. As shown in FIG. 8, the electromagnetic steel plates 14 </ b> C are provided every other circumferential direction so that the connecting portions 143 alternate with the connecting portions 143 of the electromagnetic steel plates 14 </ b> A in the circumferential direction. The electromagnetic steel plate 14C has the same shape as the electromagnetic steel plate 14A, and is shifted in the circumferential direction so that the connecting portions 143 alternate with the connecting portions 143 of the electromagnetic steel plate 14A in the circumferential direction.

  The region F1 of the third rotor core 14 shown in FIG. 5 is configured by laminating electromagnetic steel plates 14A in the thickness direction. The region F2 is configured by laminating electromagnetic steel plates 14B in the thickness direction. The region F3 is configured by stacking electromagnetic steel plates 14C in the thickness direction. That is, the 3rd rotor core 14 is comprised by laminating | stacking two types of electromagnetic steel plates from which a shape differs substantially.

  As shown in FIG. 9, the field winding 15 shown in FIG. 1 has an annular shape that generates a magnetic flux for forming magnetic poles in the first rotor core 12 and the second rotor core 13 when a current flows. It is a member. The field winding 15 is disposed so as to be sandwiched between the first rotor core 12 and the second rotor core 13.

  The shaft 16 is a columnar member made of metal that fixes the first rotor core 12 and the second rotor core 13.

  As shown in FIG. 10, the first rotor core 12 is configured such that, from one end side of the third rotor core 14, the outer peripheral surface of the protruding portion 121 contacts the outer peripheral surface holding portion 140, and the side surface of the protruding portion 121 is the side surface. The third rotor core 14 is assembled so as to be in contact with the holding portion 141. In the second rotor core 13, the outer peripheral surface of the protrusion 131 is held from the other end side of the third rotor core 14 in a state where the protrusions 131 alternate with the protrusions 121 in the circumferential direction. The third rotor core 14 is assembled such that the side surface of the protruding portion 131 contacts the side surface holding portion 141 while being in contact with the portion 140. The field winding 15 is disposed between the first rotor core 12 and the second rotor core 13 in the third rotor core 14 together with the first rotor core 12 and the second rotor core 13. It is assembled. The shaft 16 is fixed to the hole 120b of the first rotor core 12 and the hole 130b of the second rotor core 13.

  As a result, as shown in FIG. 11, with the field winding 15 disposed between the first rotor core 12 and the second rotor core 13, the protrusion 121 of the first rotor core 12 and the first rotor core 12 The protrusions 131 of the two-rotor core 13 are alternately arranged in the circumferential direction. As shown in FIGS. 12 and 13, the outer peripheral surfaces of the protruding portions 121 and 131 are held by the outer peripheral surface holding portion 140, and the side surfaces of the protruding portions 121 and 131 are held by the side surface holding portion 141. Furthermore, although a part of the illustration is omitted, a connecting portion 143 is provided on the radially inner side of the axial projecting portions 121b and 131b in contact with these inner peripheral surfaces, and the axial projecting portion 121b is provided by the connecting portion 143. 131b are held.

  As shown in FIG. 1, the first rotor core 12 and the second rotor core 13 that are assembled to the third rotor core 14 and fixed to the shaft 16 with the field winding 15 disposed are The three rotor cores 14 are rotatably provided in a state where the outer peripheral surface of the three rotor cores 14 is opposed to the inner peripheral surface of the stator core 10 with a space therebetween.

  Next, the operation of the rotating electrical machine of the first embodiment will be described with reference to FIG.

  In FIG. 1, when a direct current is supplied to the field winding 15 via a slip ring or the like (not shown), the protruding portion 121 of the first rotor core 12 and the protruding portion 131 of the second rotor core 13. In addition, magnetic poles having different polarities are formed. Magnetic flux generated by the magnetic poles formed on the protrusions 121 and 131 flows to the stator core 10 via the third rotor core 14. When an alternating current is supplied to the stator winding 11 in this state, the magnetic flux generated by the magnetic poles formed in the protrusions 121 and 131 and the current flowing through the stator winding 11 are linked, and the field winding 15 Torque is generated in the first rotor core 12 and the second rotor core 13 assembled to the third rotor core 14 in a state in which is disposed.

  Next, the effect of the rotating electrical machine of the first embodiment will be described.

  According to the first embodiment, the third rotor core 14 includes the connecting portion 143. The connecting portion 143 is a portion that connects the side surface holding portions 141 adjacent in the circumferential direction on the radially inner side of the axial projecting portions 121b and 131b. Therefore, the strength of the third rotor core 14 against centrifugal force can be improved without increasing the radial dimension.

  According to the first embodiment, the third rotor core 14 includes the groove 142. The groove portion 142 is a portion that is formed in the side surface holding portion 141 provided integrally with the outer peripheral surface holding portion 140 and that opens in the radial direction and extends in the axial direction. Since it opens to the radial inside, the leakage of the magnetic flux inside the radial direction between the protrusions 121 and 131 where the magnetic poles are formed can be suppressed. Therefore, it is possible to suppress the deterioration of the characteristics of the rotating electrical machine 1.

  According to 1st Embodiment, the 3rd rotor core 14 is a member which consists of a laminated body which laminated | stacked the electromagnetic steel plate in the plate | board thickness direction. Therefore, eddy current loss can be suppressed.

  According to 1st Embodiment, the connection part 143 is provided so that it may contact the internal peripheral surface of the axial direction protrusion parts 121b and 131b, and may hold | maintain an internal peripheral surface. Therefore, the deformation of the axial protrusions 121b and 131b accompanying the rotation can be more reliably suppressed.

(Second Embodiment)
Next, the rotary electric machine of 2nd Embodiment is demonstrated. In the rotating electrical machine of the second embodiment, the rotating electrical machine of the first embodiment is not provided with anything in the groove portion, whereas a permanent magnet is provided in the groove portion.

  The rotating electrical machine of the second embodiment has the same configuration as the rotating electrical machine of the first embodiment except for the permanent magnet. Therefore, the description other than the permanent magnet is omitted unless necessary. First, the configuration of the rotating electrical machine of the second embodiment will be described with reference to FIG.

  As shown in FIG. 14, the rotating electrical machine 2 includes a first rotor core 22, a second rotor core 23, a third rotor core 24, and a permanent magnet 27.

  The first rotor core 22, the second rotor core 23, and the third rotor core 24 are the same as the first rotor core 12, the second rotor core 13, and the third rotor core 14 of the first embodiment. It is the same and is comprised similarly.

  The permanent magnet 27 is a rectangular plate-like member that generates magnetic flux. The permanent magnet 27 has an N pole and an S pole formed on the surface facing away from the plate thickness direction. The permanent magnet 27 is inserted and fixed in the groove portion 242 of the third rotor core 24 so that the same magnetic pole faces in the circumferential direction.

  The magnetic flux supplied to the stator core by the permanent magnet 27 is different from that of the rotating electrical machine 1 of the first embodiment, but the rest is the same as that of the rotating electrical machine of the first embodiment including the operation. Therefore, the description about operation | movement of the rotary electric machine of 2nd Embodiment is abbreviate | omitted. Next, the effect of the rotating electrical machine of the second embodiment will be described.

  According to the second embodiment, by having the same configuration as that of the first embodiment, the same effect as that of the first embodiment corresponding to the same configuration can be obtained.

  According to the second embodiment, the rotating electrical machine 2 has the permanent magnet 27 in the groove 242. Therefore, the characteristics of the rotating electrical machine 2 can be improved as compared to the case where the groove portion does not have a permanent magnet as in the first embodiment.

(Third embodiment)
Next, the rotary electric machine of 3rd Embodiment is demonstrated. In the rotating electrical machine of the third embodiment, the rotating electrical machine of the first embodiment configures the third rotor core by two types of electromagnetic steel plates, while the third rotor core is configured by one type of electromagnetic steel plates. It is configured.

  The rotating electrical machine of the third embodiment has the same configuration as the rotating electrical machine of the first embodiment except for the third rotor core. Therefore, the description other than the third rotor core is omitted unless necessary. First, the configuration of the rotating electrical machine of the third embodiment will be described with reference to FIGS.

  The third rotor core 34 shown in FIG. 15 is configured by a laminated body in which the electromagnetic steel plates 34A and 34B shown in FIGS. 16 and 17 are laminated in the thickness direction. The electromagnetic steel plates 34A and 34B include an outer peripheral surface holding portion 340, a side surface holding portion 341, a groove portion 342, and a connecting portion 343.

  As shown in FIG. 16, the electromagnetic steel sheet 34 </ b> A is provided with every other connecting portion 343 in the circumferential direction. As shown in FIG. 17, the electromagnetic steel plates 34B are provided every other circumferential direction so that the connecting portions 343 alternate with the connecting portions 343 of the electromagnetic steel plate 34A in the circumferential direction. The electromagnetic steel plate 34B has the same shape as the electromagnetic steel plate 34A, and is shifted in the circumferential direction so that the connecting portions 343 alternate with the connecting portions 343 of the electromagnetic steel plate 34A in the circumferential direction.

  The region F1 of the third rotor core 34 shown in FIG. 15 is configured by laminating electromagnetic steel plates 34A in the thickness direction. The region F2 is configured by alternately laminating the electromagnetic steel plates 34B and the electromagnetic steel plates 34A in this order in the thickness direction. The region F3 is configured by laminating electromagnetic steel plates 34B in the thickness direction. That is, the third rotor core 34 is composed of one type of electromagnetic steel sheet having substantially the same shape, the radial protrusions and the axial protrusions of the first rotor core, and the radial protrusions of the second rotor core. In addition, the position is shifted in the circumferential direction according to the protruding portion in the axial direction, and stacked in the thickness direction. As a result, on the radially inner side of the axial protrusions 321b and 331b, a portion where the connecting portion 343 is provided continuously in the axial direction and a portion provided every other electromagnetic steel sheet in the axial direction are formed. Is done.

  Since the operation of the rotating electrical machine of the third embodiment is the same as that of the first embodiment, the description thereof is omitted. Next, the effect of the rotating electrical machine of the third embodiment will be described.

  According to the third embodiment, by having the same configuration as that of the first embodiment, it is possible to obtain the same effect as that of the first embodiment corresponding to the same configuration.

  According to the third embodiment, the third rotor core 34 includes an outer peripheral surface holding portion 340, a side surface holding portion 341, and a connecting portion 343 formed so as not to be provided adjacent to the circumferential direction. According to the radial protrusion and the axial protrusion of the first rotor core, and the radial protrusion and the axial protrusion of the second rotor core. The positions are shifted in the circumferential direction and laminated in the plate thickness direction. Therefore, the strength of the third rotor core 34 against centrifugal force can be improved without increasing the radial dimension. In addition, the third rotor core 34 can be manufactured with reduced costs.

  According to the third embodiment, the electromagnetic steel plates 34A and 34B have substantially the same shape, and the connecting portions 343 are provided every other connection in the circumferential direction. For this reason, more connecting portions can be provided in the axial direction on the radially inner side of the axial projecting portion than in the case where it is not provided every other. Therefore, when the 3rd rotor core 34 is comprised with one type of electromagnetic steel plate, the intensity | strength of the 3rd rotor core 34 with respect to a centrifugal force can be improved more.

  In the third embodiment, an example in which every other connecting portion 343 of the electromagnetic steel plates 34A and 34B is provided in the circumferential direction is described, but the present invention is not limited to this. The connection part should just be formed so that it may not be provided adjacent to the circumferential direction. In this case, the connecting portion can be provided in at least one of the axial directions on the radially inner side of the axial projecting portion by adjusting how to shift the position in the circumferential direction.

  In the third embodiment, on the radially inner side of the axial projecting portions 321b and 331b, a portion where the connecting portions 343 are provided continuously in the axial direction and a portion provided every other electromagnetic steel sheet in the axial direction. However, the present invention is not limited to this. The connection part 343 should just be provided in at least any of the axial direction inside the radial direction of the axial direction protrusion parts 321b and 331b.

(Fourth embodiment)
Next, the rotary electric machine of 4th Embodiment is demonstrated. In the rotating electrical machine of the fourth embodiment, the rotating electrical machine of the first embodiment is provided with a field winding between the first rotor core and the second rotor core. A field winding is provided to face the bottom and the bottom of the second rotor core.

  First, the configuration of the rotating electrical machine of the fourth embodiment will be described with reference to FIGS.

  As shown in FIG. 18, the rotating electrical machine 4 includes a stator core 40, a stator winding 41, a first rotor core 42, a second rotor core 43, a third rotor core 44, a field, Magnetic windings 450 and 451, yokes 452 and 453, and a shaft 46 are provided.

  The stator core 40 and the stator winding 41 shown in FIG. 19 have the same configuration as the stator core 10 and the stator winding 11 of the first embodiment. Since the configuration of the field winding is different from that of the first embodiment, the axial dimension is smaller than that of the stator core 10 and the stator winding 11.

  The first rotor core 42 and the second rotor core 43 shown in FIGS. 20 and 21 have the same configuration as the first rotor core 12 and the second rotor core 13 of the first embodiment. Since the configuration of the field winding is different from that of the first embodiment, the cross-sectional shapes of the bottom portions 420 and 430 are different. Further, the axial dimension of the axial projecting portions 421b and 431b is smaller than that of the axial projecting portions 121b and 131b.

  The 3rd rotor core 44 shown in FIG. 22 is the same structure as the 3rd rotor core 14 of 1st Embodiment. Since the configuration of the field winding is different from that of the first embodiment, the axial dimension is smaller than that of the third rotor core 14.

  The field windings 450 and 451 shown in FIG. 23 and FIG. 24 generate a magnetic flux in the same direction for forming magnetic poles in the first rotor core 12 and the second rotor core 13 when a current flows. It is a member.

  The yokes 452 and 453 are bottomed cylindrical members made of a magnetic material that constitutes a part of the magnetic path and holds the field windings 450 and 451. Specifically, it is a member integrally composed of iron. The yokes 452 and 453 include bottom portions 452a and 453a and outer wall portions 452b and 453b.

  A bottom 452a shown in FIG. 22 is a disk-shaped portion that holds the field winding 450 and is inserted through the shaft 46 without contact. The bottom 452a is provided with a hole 452c penetrating in the axial direction through which the shaft 46 passes without contacting.

  The outer wall portion 452b is an annular portion provided on the outer peripheral portion of the axial end surface of the bottom portion 452a.

  A bottom portion 453a shown in FIG. 24 is a disk-shaped portion that holds the field winding 451 and is inserted through the shaft 46 without contact. The bottom portion 453a includes a hole portion 453c penetrating in the axial direction through which the shaft 46 passes without contacting.

  The outer wall portion 453b is an annular portion provided on the outer peripheral portion of the axial end surface of the bottom portion 453a.

  As shown in FIG. 25, the first rotor core 42 is configured such that the outer peripheral surface of the protruding portion 421 contacts the outer peripheral surface holding portion 440 from the one end side of the third rotor core 44, and the side surface of the protruding portion 421 is the side surface. The third rotor core 44 is assembled so as to come into contact with the holding portion 441. In the second rotor core 43, the outer peripheral surface of the protrusion 431 is held from the other end side of the third rotor core 44 in a state where the protrusions 431 alternate with the protrusions 421 in the circumferential direction. While being in contact with the portion 440, it is assembled to the third rotor core 44 so that the side surface of the protruding portion 431 contacts the side surface holding portion 441. The yoke 452 holding the field winding 450 is connected to the one end surface of the third rotor core 44 assembled with the first rotor core 42 and the stator core 40 from one end side of the third rotor core 44. The stator core 40 is assembled so as to cover one end surface. The yoke 453 held by the field winding 451 extends from the other end side of the third rotor core 44 to the other end surface of the third rotor core 44 assembled with the second rotor core 43 and the stator core 40. It is assembled | attached to the stator core 40 so that the other end surface of this may be covered. The shaft 46 is fixed to the hole 420 b of the first rotor core 42 and the hole 430 b of the second rotor core 43 without contacting the holes 452 c and 453 c of the yokes 452 and 453.

  As shown in FIG. 18, the first rotor core 42 and the second rotor core 43 assembled to the third rotor core 44 and fixed to the shaft 46 are spaced apart from each other on the outer peripheral surface of the third rotor core 44. It is provided so as to be able to rotate in a state facing the inner peripheral surface of the stator core 40.

  Next, the operation of the rotating electrical machine of the fourth embodiment will be described with reference to FIG.

  In FIG. 18, when a direct current is supplied to the field windings 450 and 451, magnetic poles having different polarities are formed on the protruding portions of the first rotor core 42 and the second rotor core 43, respectively. The magnetic flux generated by the magnetic poles formed in the protruding portion flows to the stator core 40 via the third rotor core 44. When an alternating current is supplied to the stator winding 41 in this state, the magnetic flux generated by the magnetic pole formed in the protruding portion and the current flowing through the stator winding 41 are linked, and the third rotor core 44 is assembled. Torque is generated in the attached first rotor core 42 and second rotor core 43.

  Next, the effect of the rotating electrical machine of the fourth embodiment will be described.

  According to the fourth embodiment, by having the same configuration as that of the first embodiment, the same effect as that of the first embodiment corresponding to the same configuration can be obtained.

  According to the fourth embodiment, it is not necessary to supply a direct current to the field winding via a slip ring or the like as in the first embodiment. Therefore, the configuration of the rotating electrical machine can be simplified.

  In the first to fourth embodiments, the example in which the first rotor core and the second rotor core have six protrusions is given, but the present invention is not limited to this. The 1st rotor core and the 2nd rotor core should just have a some projection part.

  In 1st-4th embodiment, although the example which is an apparatus which generate | occur | produces a torque when a rotary electric machine is supplied with electric power is given, it is not restricted to this. The rotating electrical machine may be a device that generates electric power when supplied with a driving force. A similar configuration can be applied, and a similar effect can be obtained.

  In the first to fourth embodiments, an example is described in which the third stator core is configured by laminating annular electromagnetic steel plates in the plate thickness direction, but is not limited thereto. The third stator core may be configured by laminating a belt-shaped electromagnetic steel sheet in the thickness direction while spirally winding the steel sheet.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 10 ... Stator core, 12 ... 1st rotor core, 121 ... Protrusion part, 121a ... Radial direction protrusion part, 121b ... Axial direction protrusion part, DESCRIPTION OF SYMBOLS 13 ... 2nd rotor core, 131 ... Protrusion part, 131a ... Radial protrusion part, 131b ... Axial protrusion part, 14 ... 3rd rotor core, 140 ... Outer periphery Surface holding portion, 141... Side surface holding portion, 143... Connection portion, 15.

Claims (7)

A stator core (10, 40) provided with a stator winding;
A first rotor core (12, 22, 42) having a plurality of protrusions each including a radial protrusion protruding outward in the radial direction and an axial protrusion protruding in the axial direction. When,
The first rotor core has the same number of protrusions as the first rotor core, each having a radial protrusion protruding outward in the radial direction and an axial protrusion provided in the radial protrusion and protruding in the axial direction. A second rotor core (13, 23, 43) arranged such that the protrusions are alternately arranged in the circumferential direction with respect to the rotor core;
An annular outer peripheral surface holding portion that holds an outer peripheral surface in contact with an outer peripheral surface of the protruding portion of the first rotor core and the protruding portion of the second rotor core, and the first rotor core adjacent in the circumferential direction Between the projecting portion of the first rotor core and the projecting portion of the second rotor core. A side surface holding portion that contacts the side surface and holds the side surface, and at least one of the axial directions on the radially inner side of the axially protruding portion of the first rotor core and the axially protruding portion of the second rotor core. A third rotor core (14, 24, 34, 44) having a connecting portion for connecting the side surface holding portions adjacent in the circumferential direction;
Field windings (15, 450, 451) for generating magnetic flux for forming magnetic poles in the first rotor core and the second rotor core by flowing current;
Rotating electric machine having   The third rotor core is formed in the side surface holding portion provided integrally with the outer peripheral surface holding portion, and is open radially inward and extends in the axial direction (142, 242, 342, 442). The rotating electrical machine according to claim 1, comprising:   The rotating electrical machine according to claim 2, wherein the groove has a permanent magnet (27).   The rotating electrical machine according to any one of claims 1 to 3, wherein the third rotor core is formed of a laminate in which electromagnetic steel plates are laminated in a plate thickness direction.   The connecting portions (143, 243, 343, 443) hold the inner peripheral surface in contact with the inner peripheral surfaces of the axially projecting portion of the first rotor core and the axially projecting portion of the second rotor core. The rotating electrical machine according to any one of claims 1 to 4. A method of manufacturing a rotating electrical machine,
The rotating electric machine is
A stator core provided with a stator winding;
A first rotor core having a plurality of protrusions each including a radial protrusion protruding outward in the radial direction and an axial protrusion provided in the radial protrusion and protruding in the axial direction;
The first rotor core has the same number of protrusions as the first rotor core, each having a radial protrusion protruding outward in the radial direction and an axial protrusion provided in the radial protrusion and protruding in the axial direction. A second rotor core arranged so that the protrusions are alternately arranged in the circumferential direction with respect to the rotor core;
An annular outer peripheral surface holding portion that holds an outer peripheral surface in contact with an outer peripheral surface of the protruding portion of the first rotor core and the protruding portion of the second rotor core, and the first rotor core adjacent in the circumferential direction Between the projecting portion of the first rotor core and the projecting portion of the second rotor core. A side surface holding portion that contacts the side surface and holds the side surface, and at least one of the axial directions on the radially inner side of the axially protruding portion of the first rotor core and the axially protruding portion of the second rotor core. A third rotor core (34) having a connecting portion for connecting the side surface holding portions adjacent in the circumferential direction;
A field winding for generating a magnetic flux for forming magnetic poles in the first rotor core and the second rotor core by passing an electric current;
Have
The third rotor core is made of one type of electrical steel sheet having the outer peripheral surface holding portion, the side surface holding portion, and the connecting portion formed so as not to be provided adjacent to the circumferential direction. The radial and axial protrusions of the first rotor core and the radial and axial protrusions of the second rotor core are shifted in the circumferential direction and stacked in the plate thickness direction. The manufacturing method of the rotary electric machine comprised.   The said connection part (343) is a manufacturing method of the rotary electric machine of Claim 6 provided every other in the circumferential direction.

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